Damping performance and martensitic transformation of rapidly solidified Fe-17%Mn alloy

doi:10.1016/j.jmst.2021.10.042

Abstract

Abstract:

The rapid solidification of Fe-17%Mn alloy was performed to investigate the influence of cooling rate on its damping performance and martensitic transformation mechanism. A proper heat treatment was also carried out to clarify its coupled effects with rapid solidification. The stacking fault probability and martensitic transformation temperature were determined to demonstrate their relationship with the cooling rate and the heat treatment process. With the increase of cooling rate, the volume fraction of ε-martensite increased and the stacking fault probability of ε-martensite was enhanced. The formation of ε-martensite phase was remarkable for the increase of damping capacity and microhardness. It was found that rapid solidification was beneficial for the formation of ε-martensite and the improvement of damping capacity. This effect can be facilitated by the incorporation of the heat treatment process.

Key words: Damping performance, Rapid solidification, Martensitic transformation, Stacking fault probability

Na Yan, Delu Geng, Bingbo Wei. Damping performance and martensitic transformation of rapidly solidified Fe-17%Mn alloy[J]. J. Mater. Sci. Technol., 2022, 117: 1-7.

Figures/Tables 8

Fig. 1. XRD patterns of rapidly solidified and quenched 1 mm and 2 mm-thick Fe-17%Mn alloy plates: (a) and (b) rapidly-solidified; (b) is the enlargement of the dashed-box in (a); (c) fast-quenched.

Table 1. Calculated parameters of stacking fault probability in different specimens.

No.	2θ₁₁₁ /deg.	2θ₂₀₀/deg.	2θ₁₁₁^’/deg.	2θ₂₀₀^’/deg.	Δθ/deg.	P_sf/ (×10^-3)
1#	43.50	50.64	43.493	50.658	0.025	4.71
2#	43.53	50.68	43.524	50.695	0.021	3.95
3#	43.62	50.76	43.606	50.793	0.046	8.64
4#	43.52	50.66	43.512	50.680	0.029	5.46

Fig. 2. DSC analyses of rapidly solidified and quenched 1 mm and 2 mm-thick Fe-17%Mn alloy plates: (a) rapidly-solidified; (b) fast-quenched.

Fig. 3. The typical microstructure of Fe-17%Mn alloy specimens: (a) and (b) SEM graphs of rapidly solidified 1 mm and 2 mm-thick plates, (c) and (d) morphology of fast-quenched 1 mm and 2 mm-thick plates.

Fig. 4. Volume fraction of ε-martensite and microhardness in different specimens:(a) volume fraction and (b) microhardness.

Fig. 5. Typical morphologies and microstructures of rapidly solidified 1 mm-thick Fe-17%Mn alloy plate: (a) a representative TEM image, (b) the selected area diffraction (SAD) patterns corresponding to (a), (c) bright-field image of laths with stacking faults and twins, inserts are the Fast Fourier Transformation (FFT) patterns from marked areas, and (d) HRTEM images of the ε, γ phase and their phase boundary.

Fig. 6. TEM analyses of rapidly solidified 1 mm-thick Fe-17%Mn alloy plate: (a) a bright-field image showing the plate-like morphology of α’ phase, (b) the corresponding SAD pattern of α’ phase in (a).

Fig. 7. Strain dependence of damping capacity in different Fe-17%Mn alloy plates: (a) rapidly solidified 1 mm and 2 mm-thick plates with different cooling rate; (b) rapidly solidified 2 mm-thick plates with and without heat treatment.

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